bird puzzle

[mskavi]

Q : Some birds settled on the branches of tree. First they set one to a branch and there was one bird too many. Next they set two to a branch and there was one branch too many. how many branches were there?

[Admin]

Number of branches = x
Number of birds = y

x = y - 1
2x = y + 2
-----------------
x = 3
-----------------

ie. y = 4

====>> 3 branches and 4 birds.